For thousands of years before humans harnessed electricity and created light bulbs, people rose and slept based the sun. This seems to be the natural rhythm humans were designed to follow.
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For thousands of years before humans harnessed electricity and created light bulbs, people rose and slept based the sun. This seems to be the natural rhythm humans were designed to follow.

Chronic jet lag alters the brain in ways that cause memory and learning problems long after one’s return to a regular 24-hour schedule, according to research findings.
Researchers develop computational method for aligning internal body clock with local, environmental time.
Traveling across several times zones can cause an individual to experience jet lag, which includes trouble sleeping at night and trouble remaining awake during the day.

New research conducted by Charles Wingo and his colleagues, at the University of Florida, Gainsville, suggests a link between the circadian rhythm and control of sodium (salt) levels in mice.
The hormone aldosterone regulates levels of sodium in the blood and thereby helps control blood pressure.
If there’s one thing most everyone knows about newborn babies, it’s that babies don’t sleep through the night, and neither do their parents. But in fact, those first six months of life are crucial to developing the regular sleeping and waking patterns, known as circadian rhythms, that a child will need for a healthy future.
Some children may start life with the sleep odds stacked against them, though, say some sleep experts who study the issue.
As of May 2, 2009 at 9:47 p.m. (-0500) (ET), the U.S. population
was 306,340,710. Sleep researchers estimate approximately seven percent
of the population suffers from obstructive sleep apnea. Using that
estimate, there are potentially 21,443,850 apneics in the U.S.
~~ Apnea around the world ~~
As of May 2, 2009 at 9:47 p.m. (-0500) (ET), the world population
was 6,777,286,604. Sleep researchers estimate approximately seven percent
of the population suffers from obstructive sleep apnea. Using that
estimate, there are potentially 474,410,062 apneics in the world.